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Lightweight 4over6 Deployment Considerations

Explore deployment models of Lightweight 4over6, operational insights, and case studies for successful implementation, along with testing results and future steps.

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Lightweight 4over6 Deployment Considerations

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  1. Deployment Considerations for Lightweight 4over6draft-sun-softwire-lightweigh-4over6-deploymentIETF 83-Paris, March 2012 Q, Sun, C. Xie, and Y. Lee

  2. Lightweight 4over6 Deployment Considerations • Based on preliminary experimental deployment, this work describes various deployment models of Lightweight 4over6 and operational considerations for lightweight 4over6.

  3. Case Studies • Case 1: Standalone Deployment Scenario DHCPv6 RFC6334 Host Host Initiator Concentrator Host IPv4-in-IPv6 Tunnel

  4. Case Studies (Cont’d) • Case 2: Integrated Network Element with Lightweight 4over6 and DS-Lite AFTR Scenario • Option1: Separated tunnel instances with different virtual addresses for DS-Lite and lw4over6 4over6: changsha.lw4over6.aftr ds-lite: changsha.dslite.aftr DHCPv6 Host RFC6334 Initiator Concentrator /DS-Lite Host Host B4 IPv4-in-IPv6 Tunnel • Requirement: Initiator and B4 can be distinguished in one network and different FQDNs should be configured accordingly.

  5. Case Studies (Cont’d) • Case 2: Integrated Network Element with Lightweight 4over6 and DS-Lite AFTR Scenario • Option2: Separated tunnel instances for DS-Lite and lw4over6 with the same tunnel address 4over6: changsha.aftr ds-lite: changsha.aftr DHCPv6 4over6: {src addr: 202.112.0.32/24} ds-lite: {src addr: 192.0.0.0/29} Host RFC6334 Initiator Host Concentrator /DS-Lite Host B4 v6 v4 payload IPv4-in-IPv6 Tunnel • Requirement: The network element need to examine every packet on its source IPv4 address.

  6. Case Studies (Cont’d) • Case 3: DS-Lite Coexistent scenario with separated AFTRs 4over6: changsha.lw4over6.aftr ds-lite: changsha.dslite.aftr DHCPv6 Host RFC6334 Initiator Concentrator Host Host B4 DS-Lite • Requirement: Initiator and B4 can be distinguished in one network and different FQDNs should be configured accordingly.

  7. Overall Deployment Considerations • Addressing and Routing • In Lightweight 4over6, there is no inter-dependency between IPv4 and IPv6 addressing schemes. • Port-set Management • This port-set assignment should be synchronized between port management server and the Concentrator. • Concentrator Discovery • Initiator can use the same DHCPv6 option [RFC6334] to discover the FQDN of the Concentrator.

  8. Concentrator Deployment Consideration • Lightweight 4over6 and DS-Lite share similar deployment considerations. • Interface consideration • MTU • Fragment • Lawful Intercept Considerations • Blacklisting a shared IPv4 Address • AFTR's Policies • … • Refer to [I-D.ietf-softwire-dslite-deployment]

  9. Concentrator Deployment Consideration(Cont’d) • Logging at the Concentrator • Operators only log one entry per subscriber • The log should include subscriber’s IPv6 address used for the softwire, the public IPv4 address and the port-set • Reliability Considerations of Concentrator • The backup Concentrator must either have the subscriber mapping already provisioned • or notify the Initiator to create a new mapping in the backup Concentrator.

  10. Concentrator Deployment Consideration(Cont’d) • Placement of AFTR • In the "centralized model", the Concentrator could be located at the higher place. It is cost-effective and easy to manage. • In the "distributed model", Concentrator is usually integrated with the BRAS/SR. • Port set algorithm consideration • Contiguous port range may introduce security risk because hackers can make a more predictable guess of what port a subscriber may use. • Non-continuous port set algorithms can be used to improve security.

  11. Test Result • It has good scalability, supporting more than one hundred million concurrent sessions on a normal PC. • Lightweight 4over6 can be deployed rapidly, with little impact on existing addressing and routing. • It is simple to achieve traffic logging. • Lightweight 4over6 can support a majority of current IPv4 applications. • Lightweight 4over6 can be coexistent with DS-Lite easily.

  12. Conclusion and Next Steps • We have deployed it in Hunan province, China. Our test result: • It is simple and can be deployed rapidly. • It has good scalability. • It can support a majority of current IPv4 applications. • It can be coexistent with DS-Lite easily. • Adopt the document as WG item?

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